Career
Daniel Tji Hak Soun was ordained a priest on December 15, 1952. On March 22, 1965, Pope Paul VI appointed him Bishop of Wonju. He was consecrated bishop on June 29, 1965 by Antonio del Giudice.
Company-consecrators were the Bishop Thomas F. Quinlan of the Diocese of Chunchon and Bishop John A. Choi Jae-seon of the Diocese of Busan.